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    <title>JavaScript字符串</title>
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    <p>字符串是存储字符（比如 "Bill Gates"）的变量。</p>
    <p>字符串可以是引号中的任意文本。您可以使用单引号或双引号</p>
    <p>您可以在字符串中使用引号，只要不匹配包围字符串的引号即可</p>
    <script>
        var carname1 = "Volvo XC60";
        var carname2 = 'Volvo XC60';
        //您可以在字符串中使用引号，只要不匹配包围字符串的引号即可：
        var answer1 = 'It\'s alright';  //"It's alright"
        var answer2 = "He is called \"Johnny\"";    //"He is called 'Johnny'"
        var answer3 = 'He is called "Johnny"';
        document.write(carname1 + "<br />");
        document.write(carname2 + "<br />");
        document.write(answer1 + "<br />");
        document.write(answer2 + "<br />");
        document.write(answer3 + "<br />");
    </script>
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